CN102900476B - Low-leakage brush type sealing structure based on piezoelectric effect - Google Patents
Low-leakage brush type sealing structure based on piezoelectric effect Download PDFInfo
- Publication number
- CN102900476B CN102900476B CN201210355563.3A CN201210355563A CN102900476B CN 102900476 B CN102900476 B CN 102900476B CN 201210355563 A CN201210355563 A CN 201210355563A CN 102900476 B CN102900476 B CN 102900476B
- Authority
- CN
- China
- Prior art keywords
- brush
- piezoelectric effect
- brush silk
- seal structure
- low leakage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000000694 effects Effects 0.000 title claims abstract description 30
- 238000007789 sealing Methods 0.000 title abstract description 13
- 230000010287 polarization Effects 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- ZWAOHEXOSAUJHY-ZIYNGMLESA-N doxifluridine Chemical compound O[C@@H]1[C@H](O)[C@@H](C)O[C@H]1N1C(=O)NC(=O)C(F)=C1 ZWAOHEXOSAUJHY-ZIYNGMLESA-N 0.000 claims description 3
- 229950005454 doxifluridine Drugs 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 239000002184 metal Substances 0.000 abstract description 5
- 230000002411 adverse Effects 0.000 abstract 1
- 239000011247 coating layer Substances 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 abstract 1
- 239000000835 fiber Substances 0.000 description 7
- 235000004443 Ricinus communis Nutrition 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Turbine Rotor Nozzle Sealing (AREA)
- Spark Plugs (AREA)
Abstract
The invention discloses a low-leakage brush type sealing structure based on a piezoelectric effect. The low-leakage brush type sealing structure comprises a brush wire region consisting of brush wires, and a front baffle and a rear baffle which are used for clamping the constraint end of the brush wire region; after being blown down, the brush wire region is in contact with a rear baffle, and the free end of the brush wire region is in contact with a rotor; each brush wire consists of a metal core, a piezoelectric ceramic wrapping the metal core, a surface electrode wrapping the piezoelectric ceramic and an insulative coating layer wrapping the surface electrode; the piezoelectric polarization direction of each brush wire is opposite to that of a brush wire adjacent to the brush wire; and a conductive layer is coated on the constraint end of the brush wire region, and the constraint end of the brush wire region is grounded in a short circuit manner. 'Dispersion effect', 'fan-shaped scattering' and 'hysteresis effect' and other factors having adverse influence on sealing can be relieved and even eliminated; and therefore, leakage can be reduced.
Description
Technical field
The present invention relates to mechanical sealing technology field, be specifically related to a kind of low leakage brush seal structure of utilizing piezoelectric effect.
Background technique
In turbomachine especially aeroengine, often need to seal different pressures chamber, and seal form between revolving part and static element has the sealing of castor tooth and brush seal conventionally.The sealing of castor tooth is a kind of noncontact seal, in order to ensure sealing castor tooth and revolving part, destruction interference does not occur, and generally has sizable gap between castor tooth and revolving part, and this causes leakage rate larger.And brush seal is a kind of seal form of flexible contact, its leakage rate is the 1/5-1/10 of castor tooth sealing, and allow the serious decentraction of transient state between sound and keep sealability constant, not only having improved unit efficiency but also improved the stability of rotor, is one of key technology of modern advanced turbine engine development.Brush seal has been applied to the turbomachines such as aeroengine, industry gas turbine and steam turbine.At aviation field, application brush seal is to improve the important means of aero-engine performance, in the technological innovation of the world such as GE, Siemens Ge great turbine company and development, all one of using brush seal technical research as important content wherein.
But brush seal has " dispelling effect " and " fan-shaped is scattered " phenomenon in actual applications, this causes leakage rate to increase, and has limited the application of brush seal under High Pressure Difference condition.Application number be the more detailed introduction of the patent of invention of " 200780030625.0 " " dispelling effect " and " fan-shaped is scattered ", the schematic diagram of two kinds of phenomenons is shown in Fig. 1 and Fig. 2.In addition, in the time that pressure reduction has large variation, brush silk does not often have response timely, and when this causes boosting with step-down, leakage rate curve is not gone the same way, i.e. " hesitation ".For example, in the time that pressure reduction improves suddenly, brush silk " is not blown down (blow down) " in time, and the arrangement between brush silk is fine and close not, and this will cause the unexpected raising of leakage rate.Low leakage brush seal structure for these unfavorable phenomenon design performance excellences is problem demanding prompt solution.The solution that the patent of invention that application number is " 200780030625.0 " proposes is to be provided with along the longitudinal direction film or dish in brush silk region, the effect that brush tow is played constraint and supported.But, the film that foregoing invention patent is mentioned or dish will be brushed tow and be isolated into several sections along (rotating shaft) axial direction, cause porosity ratio between brush silk to become large, brush tow outside axially may have the danger of entirety " being dispelled " or " fan-shaped is scattered ", do not tackle the problem at its root, and can cause the flexibility in Shua Si district to decline.
It is contemplated that, if (as High Pressure Difference, sudden change pressure reduction) can produce cohesion naturally under harsh operating mode between brush silk, so just can alleviate and even eliminate above-mentioned " dispelling effect ", " fan-shaped is scattered " and " hesitation " etc. to sealing disadvantageous phenomenon.
Piezoelectric effect is a kind of very peculiar natural phenomenon.In the time that piezoelectric crystal or piezoelectric constant are subject to external force and deformation occur, on its some surface, there will be and the charge accumulation of the linear ratio of external force, this phenomenon is called piezoelectric effect.But piezo ceramic element generally has very large fragility, hardness is high, wear-resisting, but easily brittle failure.The patent of invention that application number is " 200810019459.0 " has proposed a kind of metal-cored piezoelectric ceramic fibers that contains, that this fiber comprises is metal-cored, be coated on piezoelectric constant on metal-cored and the electrode on piezoelectric constant surface, wherein metal-cored fine with associativity piezoelectric constant, fiber diameter can be between 50 microns to 1000 microns.The electrode of the metal-cored and outer surface of this fiber can be used as the two poles of the earth of piezoelectric constant, and fiber has the piezoelectricity of piezoelectric constant and metal-cored rigidity and flexibility concurrently, can be used as sensor or driver.
This " piezoelectric ceramic fibers of metal core " can accomplish something at the aspect such as " dispelling effect ", " fan-shaped is scattered " and " hesitation " that solves brush seal.
Summary of the invention
For solving above-mentioned problems of the prior art, the object of the present invention is to provide a kind of low leakage brush seal structure of utilizing piezoelectric effect, " dispelling effect ", " fan-shaped is scattered " and " hesitation " etc. can be alleviated and even eliminate to sealing disadvantageous phenomenon, and then leakage can be reduced.
For achieving the above object, the technical solution adopted in the present invention is:
A kind of low leakage brush seal structure of utilizing piezoelectric effect, comprise by brush silk 4 and form Shua Si district 3, clamping Shua Si district 3 retrains front screen 1 and the backboard 2 of end, Shua Si district 3 contacts with backboard 2 after being blown down, free end contacts with rotor, described brush silk 4 is by metal-cored 41, be coated on the piezoelectric constant 42 of metal-cored 41 outsides, the insulation coating 44 that is coated on the surface electrode 43 of piezoelectric constant 42 outsides and is coated on surface electrode 43 outsides forms, the piezoelectric polarization direction of the every brush silk 4 brush silks 4 that are adjacent is contrary, constraint end in described Shua Si district 3 is coated with conductive layer 31 and is short-circuit ground.
The polarised direction of described brush silk 4 along brush silk 4 radially, do not limit by direction.
Described metal-cored 41 diameter is 10～200 μ m.
The outer diameter of described piezoelectric constant 42 is 50～500 μ m.
The material of described surface electrode 43 is silver, and its thickness is 0.5～10 μ m.
The material of described insulation coating 44 is epoxy resin or Furtulon, and its thickness is 0.5～10 μ m.
From cross section, the rule of arranging of described brush silk 4 is rectangular array, annular array, triangular array or parallelogram array.
The cross section of described brush silk 4 is circle, ellipse, rectangle, triangle or polygonal.
Beneficial effect of the present invention is: between the brush silk 4 of structure of the present invention, under harsh operating mode, (as High Pressure Difference, sudden change pressure reduction) can produce cohesion, can alleviate and even eliminate " dispelling effect ", " fan-shaped is scattered " and " hesitation " etc. to sealing disadvantageous phenomenon, and under general steady state condition, between brush silk 4, there is no cohesion.Described cohesion comes from the electrostatic force that piezoelectric effect produces, when under High Pressure Difference or sudden change pressure reduction, the free end of brush silk 4 can produce deflection deformation, taking the inner arbitrary brush silk 4a of brush tow 3 as example, surface electrode 43 based on arbitrary brush silk 4a of piezoelectric effect can produce electric charge, and the piezoelectric polarization direction of the brush silk being adjacent due to arbitrary brush silk 4a is contrary, therefore the opposite polarity of the surface electrode 43 of the brush silk that arbitrary brush silk 4a is adjacent, insulation coating 44 guarantees that the opposite polarity electric charge that each brush silk produces can not be neutralized at once, due to electrostatic force, the brush silk that arbitrary brush silk 4a is adjacent can attract each other, brush silk is difficult for " being dispelled " like this, " scatter ", the electrostatic force attracting each other also can accelerate the response of brush silk in the time that pressure changes, alleviate " hesitation ", reduce the object of leaking thereby reach.And under general steady state condition, the electric charge of brush silk surface electrode 43 can slowly dissipate, between brush silk, there is no electrostatic force.In addition, because brush silk 4 be metal-cored 41 and the composite structure of piezoelectric constant 42, this makes brush threads 4 in not losing metal flexible, have again piezoelectricity concurrently.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of the present invention 1.
Fig. 2 is the structural representation of the piezoelectric ceramic fibers brush silk of the metal core that uses of the present invention.
Fig. 3 is that distortion and the electric charge of brush silk of the present invention under High Pressure Difference or sudden change pressure reduction generates schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As depicted in figs. 1 and 2, a kind of low leakage brush seal structure of utilizing piezoelectric effect of the present invention, comprise by brush silk 4 and form Shua Si district 3, clamping Shua Si district 3 retrains front screen 1 and the backboard 2 of end, Shua Si district 3 contacts with backboard 2 after being blown down, free end contacts to play sealing effect with rotor, described brush silk 4 is by metal-cored 41, be coated on the piezoelectric constant 42 of metal-cored 41 outsides, the insulation coating 44 that is coated on the surface electrode 43 of piezoelectric constant 42 outsides and is coated on surface electrode 43 outsides forms, the piezoelectric polarization direction of the every brush silk 4 brush silks 4 that are adjacent is contrary, constraint end in described Shua Si district 3 is coated with conductive layer 31 and is short-circuit ground, metal-cored 41 of all brush silks 4 be short-circuit ground.The polarised direction of brush silk 4 along brush silk 4 radially, do not limit by direction.
The diameter of preferable alloy core 41 is 10～200 μ m.
The outer diameter of preferred described piezoelectric constant 42 is 50～500 μ m.
The material of preferred described surface electrode 43 is silver, and its thickness is 0.5～10 μ m.
The material of preferred described insulation coating 44 is epoxy resin or Furtulon, and its thickness is 0.5～10 μ m.
From cross section, the rule of arranging of described brush silk 4 is rectangular array, annular array, triangular array or parallelogram array.The present embodiment is parallelogram array.
The cross section of described brush silk 4 is circle, ellipse, rectangle, triangle or polygonal.The present embodiment is circular.
As shown in Figure 3, for distortion and the electric charge of brush silk of the present invention under High Pressure Difference or sudden change pressure reduction generates schematic diagram.When under High Pressure Difference or sudden change pressure reduction, the free end of brush silk 4 can produce deflection deformation, taking the inner arbitrary brush silk 4a of brush silk 4 as example, surface electrode 43 based on arbitrary brush silk 4a of piezoelectric effect can produce electric charge, and the piezoelectric polarization direction of the brush silk being adjacent due to arbitrary brush silk 4a is contrary, therefore the opposite polarity of the surface electrode 43 of the brush silk that arbitrary brush silk 4a is adjacent.
Claims (8)
1. one kind is utilized the low leakage brush seal structure of piezoelectric effect, comprise by brush silk (4) and form Shua Si district (3), front screen (1) and the backboard (2) of constraint end, clamping Shua Si district (3), Shua Si district (3) contacts with backboard (2) after being blown down, free end contacts with rotor, it is characterized in that: described brush silk (4) is by metal-cored (41), be coated on metal-cored (41) outside piezoelectric constant (42), be coated on the outside surface electrode (43) of piezoelectric constant (42) and be coated on outside insulation coating (44) composition of surface electrode (43), the piezoelectric polarization direction of the brush silk (4) that every brush silk (4) is adjacent is contrary, be coated with conductive layer (31) and be short-circuit ground in the constraint end in described Shua Si district (3).
2. a kind of low leakage brush seal structure of utilizing piezoelectric effect according to claim 1, is characterized in that: the polarised direction of described brush silk (4) along brush silk (4) radially.
3. a kind of low leakage brush seal structure of utilizing piezoelectric effect according to claim 1, is characterized in that: the diameter of described metal-cored (41) is 10～200 μ m.
4. a kind of low leakage brush seal structure of utilizing piezoelectric effect according to claim 1, is characterized in that: the outer diameter of described piezoelectric constant (42) is 50～500 μ m.
5. a kind of low leakage brush seal structure of utilizing piezoelectric effect according to claim 1, is characterized in that: the material of described surface electrode (43) is silver, and its thickness is 0.5～10 μ m.
6. a kind of low leakage brush seal structure of utilizing piezoelectric effect according to claim 1, is characterized in that: the material of described insulation coating (44) is epoxy resin or Furtulon, and its thickness is 0.5～10 μ m.
7. a kind of low leakage brush seal structure of utilizing piezoelectric effect according to claim 1, is characterized in that: from cross section, the rule of arranging of described brush silk (4) is annular array, triangular array or parallelogram array.
8. the brush seal structure of a kind of low leakage that utilizes piezoelectric effect according to claim 1, is characterized in that, the cross section of described brush silk (4) is circle, ellipse or polygonal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210355563.3A CN102900476B (en) | 2012-09-21 | 2012-09-21 | Low-leakage brush type sealing structure based on piezoelectric effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210355563.3A CN102900476B (en) | 2012-09-21 | 2012-09-21 | Low-leakage brush type sealing structure based on piezoelectric effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102900476A CN102900476A (en) | 2013-01-30 |
| CN102900476B true CN102900476B (en) | 2014-11-26 |
Family
ID=47572929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210355563.3A Expired - Fee Related CN102900476B (en) | 2012-09-21 | 2012-09-21 | Low-leakage brush type sealing structure based on piezoelectric effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102900476B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107630721B (en) * | 2017-10-12 | 2023-10-03 | 昆明理工大学 | Equal-split circumference spliced brush type seal |
| CN107939974B (en) * | 2017-11-28 | 2019-04-26 | 沈阳航空航天大学 | A kind of adjustable magnetic damping suppression is quivered brush seal structure |
| CN108757055B (en) * | 2018-05-24 | 2020-07-28 | 西安交通大学 | Labyrinth seal structure with brush type sealing strip |
| CN108979741A (en) * | 2018-09-04 | 2018-12-11 | 昆明理工大学 | It is a kind of can unitary rotation the high pressure-bearing of low abrasion brush seal |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0243791A1 (en) * | 1986-04-16 | 1987-11-04 | Mtu Motoren- Und Turbinen-Union MàNchen Gmbh | Seal between rotating machine members |
| CN101217179A (en) * | 2008-01-09 | 2008-07-09 | 南京航空航天大学 | A piezoelectric ceramic fiber with metal cores |
| CN101506553A (en) * | 2006-08-18 | 2009-08-12 | 西门子公司 | Brush seal for a turbomachine |
| JP2010525254A (en) * | 2007-04-16 | 2010-07-22 | レックスノード インダストリーズ， エルエルシー | Brush seal |
| CN102110772A (en) * | 2010-11-29 | 2011-06-29 | 南京航空航天大学 | Preparation method of piezoelectric ceramic fiber intelligent interlayer |
| CN202125327U (en) * | 2011-07-06 | 2012-01-25 | 上海丹迪电力技术有限公司 | Brush type ferrite sealing structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080284107A1 (en) * | 2004-05-04 | 2008-11-20 | Flaherty Andrew L | Ceramic Brush Seals |
-
2012
- 2012-09-21 CN CN201210355563.3A patent/CN102900476B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0243791A1 (en) * | 1986-04-16 | 1987-11-04 | Mtu Motoren- Und Turbinen-Union MàNchen Gmbh | Seal between rotating machine members |
| CN101506553A (en) * | 2006-08-18 | 2009-08-12 | 西门子公司 | Brush seal for a turbomachine |
| JP2010525254A (en) * | 2007-04-16 | 2010-07-22 | レックスノード インダストリーズ， エルエルシー | Brush seal |
| CN101217179A (en) * | 2008-01-09 | 2008-07-09 | 南京航空航天大学 | A piezoelectric ceramic fiber with metal cores |
| CN102110772A (en) * | 2010-11-29 | 2011-06-29 | 南京航空航天大学 | Preparation method of piezoelectric ceramic fiber intelligent interlayer |
| CN202125327U (en) * | 2011-07-06 | 2012-01-25 | 上海丹迪电力技术有限公司 | Brush type ferrite sealing structure |
Non-Patent Citations (2)
| Title |
|---|
| 含Pt 金属芯压电陶瓷纤维的微观结构和电学性能;杜建周等;《硅酸盐学报》;20120523;第40卷(第6期);全文 * |
| 杜建周等.含Pt 金属芯压电陶瓷纤维的微观结构和电学性能.《硅酸盐学报》.2012,第40卷(第6期),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102900476A (en) | 2013-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102900476B (en) | Low-leakage brush type sealing structure based on piezoelectric effect | |
| CN1250864C (en) | Brush seal | |
| CN103711527B (en) | Brush type sealing and fingertip sealing combined seal | |
| JP4990686B2 (en) | Compressor guide vane assembly sector or turbomachine nozzle assembly sector | |
| US20080131269A1 (en) | Compliant plate seal with an annular ring for turbomachinery and methods of assembling the same | |
| CN109246566B (en) | MEMS sensor | |
| US9745997B2 (en) | Speed sensor insert with bearing spacer indexing for a turbocharger | |
| JP2006144783A (en) | Damage preventing device connectable to flange of vacuum pump having high-speed rotor | |
| US20180135635A1 (en) | Airfoil structure having a shape memory alloy actuator | |
| CN102177418B (en) | Magnetic device for determining an angular position and generating a sinusoidal signal, and multiphase rotary electric machine including such a device | |
| US20110182729A1 (en) | Leaf seals | |
| JP6452140B2 (en) | Distance sensor and measuring method | |
| CN1847835A (en) | Ion sensors formed with coatings | |
| JP2013238311A (en) | Leaf seal | |
| CN107630721A (en) | A kind of spliced brush seal of circumference in equal parts | |
| CN110067602A (en) | Double three chamber brush seal structures of front apron | |
| CN103244682A (en) | Blade-type sealing device | |
| CN204792918U (en) | Surface parts electrode containing metal core piezoceramics fibre driver of screw -tupe | |
| CN107850498B (en) | Signal conduction device | |
| DE102008053072A1 (en) | Sensor for e.g. rotor blade of wind turbine, has sensor casing provided with sensor carrier and measuring element attached to sensor carrier, where sensor casing is held at casing carrier by magnetic force | |
| CN107078205A (en) | Guard electrode for piezoceramic transducer | |
| CN103498705A (en) | Low-wear brush type seal | |
| CN207936977U (en) | Capacitance sensor | |
| Bouhedma et al. | Multiphysics Modeling And Simulation Of A Dual Frequency Energy Harvester. | |
| US20180328215A1 (en) | Method and device for controlling blade outer air seals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141126 Termination date: 20170921 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |